@Article{FernándezPardo2026,
author = "Fernández-Pardo, Laura M. and Rodríguez-López, Jorge",
title = "On a fixed point theorem for operator systems and eigenvalue criteria for existence of positive solutions",
journal = "Opuscula Math.",
year = "2026",
volume = "46",
number = "2",
pages = "219--234",
doi = "https://doi.org/10.7494/OpMath.202602271",
url = "https://doi.org/10.7494/OpMath.202602271",
abstract = "We provide an alternative approach, based on the Leray-Schauder fixed point index in cones, to a fixed point theorem for operator systems due to Precup. Our focus is on the case of operators whose components are entirely of compressive type. The abstract technique is applied to a system of second-order differential equations providing a coexistence positive solution by means of an eigenvalue type criterion.",
keywords = "coexistence fixed point, fixed point index, positive solution, nonlinear systems",
issn = "1232-9274"
}